In order to change your podomatic.net URL to a personal domain. You first need to follow Weebly's instructions regarding how to point your custom domain to their servers. You may find all the information you need here.
https://www.weebly.com/app/help/us/en/topics/how-can-i-change-my-sites-address-or-domain-name
Once you have correctly pointed your DNS address to Weebly’s servers you may contact us and we will change your URL for you.
You can reach us at [email protected]
Enjoy and happy podcasting!